Overview
Zinc sulfate is an essential inorganic zinc salt with wide industrial and agricultural applications. As a micronutrient, it plays vital roles in plant growth and animal health. The compound exists in several hydrated forms, with zinc sulfate heptahydrate (ZnSO₄·7H₂O) being the most common commercial form. First identified in the 16th century, zinc sulfate has evolved from alchemical experiments to becoming a critical industrial chemical. Modern production typically involves treating zinc-containing materials with sulfuric acid, followed by purification and crystallization processes to achieve desired purity levels.
Physical and Chemical Properties
Zinc sulfate appears as colorless or white crystalline solids that are highly soluble in water. The anhydrous form is hygroscopic, readily absorbing moisture from air to form hydrates. When heated, it decomposes before melting, releasing sulfur oxides. The chemical exhibits acidic properties in aqueous solutions (pH ~4.5 for 1% solution). It reacts with bases to form zinc hydroxide and with soluble barium salts to produce barium sulfate precipitate. These properties make it useful in various chemical processes and analytical applications.
Main Applications
In agriculture, zinc sulfate serves as the primary zinc source in fertilizers, correcting zinc deficiencies in crops worldwide. The agricultural sector consumes approximately 60% of global production. In animal nutrition, it's an essential feed additive for livestock and poultry. The pharmaceutical industry uses purified zinc sulfate in dietary supplements and topical medications. Industrial applications include electrolyte for zinc plating, mordant in dyeing, preservative for wood and skins, and precursor for other zinc compounds. It also finds use in water treatment and as a coagulant in rayon production.
Safety and Storage
Zinc sulfate requires careful handling as it can cause skin and eye irritation. Workers should wear protective gloves, goggles, and dust masks when handling the powder form. Ingestion may lead to gastrointestinal distress and zinc toxicity in large quantities. Proper storage involves keeping containers tightly sealed in cool, dry, well-ventilated areas away from incompatible substances like strong bases. The compound is stable under normal conditions but may cake if exposed to moisture. Bulk storage typically uses moisture-resistant bags or lined containers to prevent quality degradation.
B2B Procurement Guide
When sourcing zinc sulfate, buyers should specify the required hydrate form and purity grade. Technical grade (98-99% purity) suits most industrial applications, while USP/BP grades are necessary for pharmaceutical uses. Packaging options range from 25kg bags to 1000kg supersacks depending on volume needs. Key procurement considerations include verifying the CAS number, requesting certificates of analysis, and evaluating supplier capability to provide consistent quality. For large agricultural buyers, seasonal demand fluctuations may affect pricing and availability. Establishing long-term contracts with reputable suppliers can ensure stable supply and better pricing terms.
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